E. Ragupathi, D. Prakash, M. Muthtamilselvan, Q. Al‐Mdallal
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引用次数: 3
Abstract
Abstract The current study is made to analyze the impact of local thermal nonequilibrium (LTNE) on the steady, incompressible, and viscous Ostwald-de-Waele nano-liquid over a rotating disk in a porous medium with the various power law index, due to many remarkable applications, such as aeronautical systems, rotating machineries, air cleaning machineries, electrical power-generating systems, heat exchangers, gas turbines, centrifugal pumps. To describe the modeling of the nano-liquid, Brownian movement and thermophoresis are employed with the passive control boundaries. Three temperature model is adopted to distinguish the temperature among the fluid, particle, and solid. The governing transport equations have been converted to a system of nonlinear coupled ordinary differential equations by employing von Karman transformation. Numerical results of the flow and heat and transfer characteristics of the fluid, particle, and solid are obtained by applying Runge–Kutta–Fehlberg method (RKF) together with the shooting technique. The numerical results in the present work are compared with the published results for the case of thermal equilibrium and found that they are in good agreement. It is observed that the temperature profile significantly varies with the fluid-particle, fluid-solid interphase heat transfer coefficients and the modified thermal capacity ratios.
摘要本研究分析了局部热非平衡(LTNE)对具有不同幂律指数的多孔介质中旋转圆盘上稳定、不可压缩和粘性的Ostwald de Waele纳米液体的影响,这些液体具有许多显著的应用,如航空系统、旋转机械、空气净化机械、发电系统,热交换器、燃气轮机、离心泵。为了描述纳米液体的建模,采用了布朗运动和热泳法以及被动控制边界。采用三温度模型来区分流体、颗粒和固体的温度。利用von Karman变换将控制输运方程转化为非线性耦合常微分方程组。采用Runge–Kutta–Fehlberg方法(RKF)和射击技术,获得了流体、颗粒和固体的流动和传热特性的数值结果。将本工作中的数值结果与已发表的热平衡情况下的结果进行了比较,发现它们非常一致。观察到,温度分布随流体颗粒、流固相间传热系数和修正的热容量比而显著变化。
期刊介绍:
The Journal of Non-Equilibrium Thermodynamics serves as an international publication organ for new ideas, insights and results on non-equilibrium phenomena in science, engineering and related natural systems. The central aim of the journal is to provide a bridge between science and engineering and to promote scientific exchange on a) newly observed non-equilibrium phenomena, b) analytic or numeric modeling for their interpretation, c) vanguard methods to describe non-equilibrium phenomena.
Contributions should – among others – present novel approaches to analyzing, modeling and optimizing processes of engineering relevance such as transport processes of mass, momentum and energy, separation of fluid phases, reproduction of living cells, or energy conversion. The journal is particularly interested in contributions which add to the basic understanding of non-equilibrium phenomena in science and engineering, with systems of interest ranging from the macro- to the nano-level.
The Journal of Non-Equilibrium Thermodynamics has recently expanded its scope to place new emphasis on theoretical and experimental investigations of non-equilibrium phenomena in thermophysical, chemical, biochemical and abstract model systems of engineering relevance. We are therefore pleased to invite submissions which present newly observed non-equilibrium phenomena, analytic or fuzzy models for their interpretation, or new methods for their description.